Weichai Group

WP12NG series bus engine

Product parameters

Mode Displacement
（L） Number of valves per cylinder Rated power/speed
(kW/rpm) Maximum torque/speed
(N·m/rpm) Min. fuel consumption on external characteristic curve
(g/kW·h) Technical route Application

WP12NG350E52 11.596 4 257/1900 1700/1200-1500 ≤186 Single point injection + DOC 18m BRT
Over 12m
luxury coach

WP12NG380E51 11.596 280/1900 1700/1200-1500 ≤186 Single point injection + DOC 18m BRT
Over 12m
luxury coach

WP12NG380E51 11.596 4 294/1900 1730/1200-1500 ≤186
Single point injection + DOC
18m BRT
Over 12m
luxury coach

Product advantages

Emission standard: Euro V.

Power performance: The four-valve structure effectively significantly improves output torque at low speed and maximum torque, as well as responsiveness during acceleration and start-up.

Economy: The rated speed is reduced to 1,900rpm, the absolute fuel consumption in bench test is reduced by 3%, ensuring a wider economic speed range; the fuel economic zone shifts to the low speed range; squish effect is strengthened and combustion speed is increased; the intelligent ignition coil increases ignition energy, reduces load cycle variation of low-speed part, and reduces fuel consumption.

Reliability: The new-type ECU has a good resistance against heat, vibration and electromagnetic interference, and is directly installed on the engine.

Mode	Displacement （L）	Number of valves per cylinder	Rated power/speed (kW/rpm)	Maximum torque/speed (N·m/rpm)	Min. fuel consumption on external characteristic curve (g/kW·h)	Technical route	Application
WP12NG350E52	11.596	4	257/1900	1700/1200-1500	≤186	Single point injection + DOC	18m BRT Over 12m luxury coach
WP12NG380E51	11.596		280/1900	1700/1200-1500	≤186	Single point injection + DOC	18m BRT Over 12m luxury coach
WP12NG380E51	11.596	4	294/1900	1730/1200-1500	≤186	Single point injection + DOC	18m BRT Over 12m luxury coach